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The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well â the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.
Looking at a solar eclipse without protective eyewear can also cause eye damage. Problems with the retina can lead to impaired vision or blindness. Cataracts can be caused from direct, intense ultraviolet rays hitting the eyes over many years. Cataracts are one of the leading causes of blindness. Cataracts develop gradually over a long time. Sunglasses that block 99% or 100% of ultraviolet rays can protect you from eye problems related to sun exposure. Sunglass labels that say UV absorption up to 400 nanometers (nm) provide 100% UV protection.